I loved everything about Frank's place. First of all, it was astonishingly clean. It had everything I needed. I think it's perfect for a solo traveller who wants a bit of quiet in the midst of the wonderful and chaotic Bangkok. It has good internet connection so it's perfect if you want to work, too. The area in which it is situated has a very characteristic Bangkok-feel and the nearby temple Wat Sutthi Wararam is well worth a visit.
I highly recommend Frank's place and I'll definitely book again when I get the chance to return to Bangkok!